On 11/20/16 20:54, h...@zytor.com wrote: > > I believe i686+ writes zero, older CPUs leave unchanged. >
I should point out that, at least from my memory, the same applies to
instructions like "movl <seg>". I can't even remember for sure how the
behavior differs between "movl <seg>,<reg32>" and "movl <seg>,<mem>";
I'd have to do some digging.
-hpa
